Connected: An Internet Encyclopedia
RFC 1772 - 9.2 Circuit Manager Properties

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### 9.2 Circuit Manager Properties

The circuit manager must have sufficient functionality to be able to compensate for the lack of periodic KEEPALIVE messages:

- It must be able to determine link layer unreachability in a predictable finite period of a failure occurring.

- On determining unreachability it should:

  - start a configurable dead timer (comparable to a typical Hold timer value).

  - attempt to re-establish the Link Layer connection.

- If the dead timer expires it should:

  - send an internal circuit DEAD indication to TCP.

- If the connection is re-established it should:

  - cancel the dead timer.

  - send an internal circuit UP indication to TCP.

Next: 9.3 TCP Properties

Connected: An Internet Encyclopedia
RFC 1772 - 9.2 Circuit Manager Properties